I don't know the facts of the OP but regardless, wouldn't stop me from riding a pick of pro caliber road bikes.
Indeed those road frames are ridden by brute riders but the forces and impacts that very light carbon ATB bike frames can take are impressive.
In 1990, I was already beating up an off-road Kestrel CS-X monocoque 26 inch hardtail including carbon flat bar by Aerosport. I assure you, was doing dumb and bold things with that bike. Never, ever had a frame issue.
Today, I have lots of confidence in a modern 29er hardtail, a far lighter carbon monocoque frame but in a complete different lay up. Admit I've bashed and bruised twice on it, the frame though- unscathed.
